Preparation of Thin Functional Layers for Anode-Supported SOFC By The Roll Coating Process

摘要

A new method for the application of functional layers for solid oxide fuel cells was tested. So-called "roll coating" is a promising process for an industrial production of SOFCs, because it allows a high degree of automation. Nickel/yttria-stabilized zirconia (Ni/YSZ), YSZ, YSZ-LSM, and La_(0.65)Sr_(0.3)MnO_(3-δ) (LSM) were used as materials for the anode, anode functional layer, electrolyte, cathode and current collector. The anode substrates were produced by tape casting. The anode and electrolyte were subsequently applied by roll coating on unsintered green tapes as well as pre-sintered substrates. After co-sintering at 1400°C for 5h, half-cells with an electrolyte thickness of 10 μm were obtained. Finally, an LSM/YSZ cathode functional layer and an LSM current collector were deposited by screen printing and co-sintered at 1100°C for 3 h. The cells had current densities of 1.0 A/cm~2 at 800°C and 0.7 V, which is lower than the performance of screen-printed Juelich standard cells with the same type of LSM/YSZ cathode. It is expected that the performance of roll-coated cells can be improved by further reducing the thickness of the functional layers. The results show that the anode-supported planar half-cells can be fabricated in a cost-effective way by combining roll coating with subsequent co-firing.